Les

FM-1 firmware · 0.2.0

Monohull

A single-voice analogue-style monosynth with a choice of five classic filter types, unison, chorus, delay and reverb.

Made by
Mark White (markterm)
Released
October 25, 2026
Install
On the FM-1 Firmware Hub · source on GitHub
Scan
Not scanned yet What we checked
Last checked
October 31, 2026

What Monohull does

  • Monohull is a one voice monosynth with two oscillators offering saw, pulse with PWM, triangle, sine and a continuous morph.
  • A sub octave, noise, hard sync, through-zero FM and ring modulation feed the mixer alongside them.
  • High mode runs the most accurate oscillators and filter solves, while Efficient swaps in cheaper versions for a lighter load.
  • Unison stacks three, five or seven detuned copies per oscillator, spread in stereo through a second filter.
  • Juno BBD chorus, ensemble chorus, ping-pong delay and reverb follow the voice, and holding FX turns all three off for DRY.
  • The arpeggiator plays up, down, up-down, random or as played over one to four octaves, latched and clock synced.
  • Play the 27 keys with OCT- and OCT+ for range, hold REC for accent, or drive it over USB and TRS MIDI.

Its modes

OSC 1
Set the first oscillator's waveform, pulse width, morph, tuning and vintage character.
OSC 2 / SUB / NOISE
Shape the second oscillator, its sync and FM, the square sub an octave or two down, and white or pink noise.
MIX / DRIVE
Balance the levels of osc 1, osc 2, sub, noise and ring, then push them into the drive stage.
FILTER
Dial cutoff, resonance, envelope amount and key tracking for the chosen filter model.
F-ENV
Set the filter envelope's attack, decay, sustain and release.
A-ENV
Set the amp envelope's attack, decay, sustain and release.
LFO 1 / 2
Pick each LFO's shape and rate, free or clock synced, with delay and fade-in.
UNISON
Choose the number of detuned copies, their detune, mix and stereo spread.
FX
Select the chorus mode and set its rate, depth and mix.
GLIDE / VOICE
Set glide time and curve, note priority, retrigger or legato and hold.

What Les checked

Monohull

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